大面积污染
广泛污染

wide area network (WAN) wide area telephone service prevention of marine pollution area zoning in urban area march in mountain area a wide place in the road wide pollution area wide seam wide set wide area comprehensive water pollution survey Wide Area Information Server wide area network wide area data service area-wide bargaining wide area information service wide area telephone service (WATS) wide area data service (WADS) present in area population reduction in area gingivectomy in edentulous area